JPS6244343B2 - - Google Patents
Info
- Publication number
- JPS6244343B2 JPS6244343B2 JP7641477A JP7641477A JPS6244343B2 JP S6244343 B2 JPS6244343 B2 JP S6244343B2 JP 7641477 A JP7641477 A JP 7641477A JP 7641477 A JP7641477 A JP 7641477A JP S6244343 B2 JPS6244343 B2 JP S6244343B2
- Authority
- JP
- Japan
- Prior art keywords
- motor
- signal
- voltage
- inversely proportional
- pickup
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005236 sound signal Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/24—Arrangements for providing constant relative speed between record carrier and head
Landscapes
- Rotational Drive Of Disk (AREA)
Description
【発明の詳細な説明】
音声信号をPCM信号に変換して記録再生する
と、Ｓ／Ｎが極めて良いのでダイナミツクレンジ
が広くなるなど、良好な記録再生を行うことがで
きる。DETAILED DESCRIPTION OF THE INVENTION When an audio signal is converted into a PCM signal and then recorded and reproduced, the S/N ratio is extremely good, so the dynamic range is widened, and excellent recording and reproduction can be performed.
従来、このようなPCM信号の記録再生装置と
しては、VTR（磁気録画再生装置）を用いてい
たが取り扱いの容易さ、装置の構成の簡素化など
の点から、円盤状の磁気デイスクを用いることが
提案された。 Conventionally, a VTR (magnetic recording and reproducing device) was used as a recording and reproducing device for such PCM signals, but from the viewpoint of ease of handling and simplification of the device configuration, a disk-shaped magnetic disk is now used. was proposed.
ところで、磁気デイスクを用いて記録再生を行
う場合に、映像信号のように周期性を有する信号
であれば、デイスクをその周期に同期した等速回
転とすることにより、スロー、スチル、クイツク
等の特殊な再生を行うことができ、良好である。 By the way, when recording and reproducing using a magnetic disk, if the signal has periodicity such as a video signal, by rotating the disk at a constant speed in synchronization with the period, slow, still, quick, etc. Special playback can be performed and is good.
しかしながら音声信号の場合、そのような必要
はなく、逆に等速回路の場合、外周と内周とで記
録密度が変化してしまうので、最内周に合せて記
録を行うと、外周部分で記録密度が低くなつて不
経済であり、最外周に合せて記録を行うと、内周
部分で記録密度が高くなつて良好な記録再生が行
えなくなる。 However, in the case of audio signals, there is no such need; conversely, in the case of a constant-velocity circuit, the recording density changes between the outer and inner circumferences, so if you record according to the innermost circumference, the outer circumference will not be the same. The recording density becomes low, which is uneconomical, and if recording is performed along the outermost circumference, the recording density becomes high at the inner circumference, making it impossible to perform good recording and reproduction.
そこで、ピツクアツプの位置を検出し、ピツク
アツプに対接する記録媒体の速度が常に一定にな
るように、等線速度制御することが考えられた。 Therefore, it has been considered to detect the position of the pickup and perform constant linear speed control so that the speed of the recording medium in contact with the pickup is always constant.
第１図はそのための制御回路を示し、図中、１
はモータであつて、このモータ１の回転力が磁気
デイスク２及び周波数発電機３に伝達される。ま
たデイスク２上にピツクアツプ、例えば磁気ヘツ
ド４が対接され、このヘツド４は送り機構（図示
せず）にて半径方向に移動される。そしてこのヘ
ツド４の位置がポテンシヨメータ５にて検出さ
れ、例えばデイスク２の中心からの距離に比例し
た電圧ＶRが比較回路６に供給される。一方周波
数発電機３からの信号が周波数−電圧変換回路７
に供給されてモータ１の回転数に反比例した電圧
ＶFが形成され、この電圧ＶFが比較回路６に供給
される。そしてこの比較回路６の出力信号がアン
プ８を通じてモータ１に供給される。 Figure 1 shows the control circuit for this purpose, and in the figure, 1
is a motor, and the rotational force of this motor 1 is transmitted to a magnetic disk 2 and a frequency generator 3. A pickup, for example a magnetic head 4, is placed in contact with the disk 2, and the head 4 is moved in the radial direction by a feeding mechanism (not shown). The position of this head 4 is detected by a potentiometer 5, and a voltage V R proportional to the distance from the center of the disk 2, for example, is supplied to a comparator circuit 6. On the other hand, the signal from the frequency generator 3 is transmitted to the frequency-voltage conversion circuit 7.
A voltage V F that is inversely proportional to the rotational speed of the motor 1 is formed, and this voltage V F is supplied to the comparator circuit 6 . The output signal of this comparison circuit 6 is then supplied to the motor 1 through an amplifier 8.
こうしてこの回路において、ＶRとＶFとが一致
するようにモータ１の回転数が制御されることに
より、モータ１の回転数、すなわちデイスク２の
回転数がピツクアツプ４の中心からの距離に反比
例した値になつて、デイスク２の等線速度制御が
行われる。 In this way, in this circuit, the rotation speed of motor 1 is controlled so that V R and V F match, so that the rotation speed of motor 1, that is, the rotation speed of disk 2, is inversely proportional to the distance from the center of pickup 4. When the value is reached, isolinear speed control of the disk 2 is performed.
なお線速度が所定の値になるようにポテンシヨ
メータ５及び変換回路７の特性を定める。 Note that the characteristics of the potentiometer 5 and the conversion circuit 7 are determined so that the linear velocity becomes a predetermined value.
ところでモータ１の回転数Ωは、モータ１の端
子電圧をＥ、モータ１の電圧ゲインをK1とし
て、
Ω＝K1・Ｅ ……(1)
となる。 By the way, the rotation speed Ω of the motor 1 is expressed as Ω=K 1 ·E ( 1 ) where E is the terminal voltage of the motor 1 and K 1 is the voltage gain of the motor 1.
一方、この回路において、比較回路６は基本的
に減算回路として働くので
Ｅ＝Ａ・（ＶF−ＶR） ……(2)
が成立する。Ａは制御系のループゲインである。 On the other hand, in this circuit, the comparator circuit 6 basically works as a subtraction circuit, so E=A.(V F -V R )...(2) holds true. A is the loop gain of the control system.
さらに、変換回路７の出力電圧ＶFは周波数に
反比例するので、
ＶF＝K2１／Ω ……(3)
となり、またΩはピツクアツプ４のデイスク２の
中心からの距離をｒ、線速度をｖとして、
Ω＝ｖ／ｒ ……(4)
と表わされ、これら(1)〜(4)式から
ＶR＝Ｋ２／ｖ−ｖ／Ｋ１Ａ・１／ｒ……(5)
が得られる。 Furthermore, since the output voltage V F of the conversion circuit 7 is inversely proportional to the frequency, V F = K 2 1/Ω (3), where Ω is the distance from the center of the disk 2 of the pickup 4, r is the linear velocity is expressed as v, Ω=v/r...(4), and from these equations (1) to (4), V R = K2 /v-v/ K1A・1/r...(5 ) is obtained.
この(5)式からも明らかなように、基準となる電
圧ＶRの値はｒに比例する項と共に、ｒに反比例
する項も有している。従つて、第１図の回路のよ
うに、ｒに比例した電圧のみを取り出した回路で
は、制御に誤差を生じることになつてしまう。 As is clear from equation (5), the value of the reference voltage V R includes a term that is proportional to r and a term that is inversely proportional to r. Therefore, in a circuit that extracts only a voltage proportional to r, such as the circuit shown in FIG. 1, an error will occur in the control.
本発明はこのような点にかんがみ、ｒは反比例
した項も考慮した制御を行えるようにしたもので
ある。 In view of these points, the present invention is designed to perform control in which r also takes into consideration an inversely proportional term.
以下、図面を参照しながら、本発明の一実施例
について説明しよう。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第２図において、ポテンシヨメータ５からの電
圧ＶRを抵抗値R1の抵抗器１１を通じて演算増幅
器１２の負荷の入力端に供給すると共に、抵抗器
１１と増幅器１２との接続点を抵抗値Ｒfの抵抗
器１３を通じて増幅器１２の出力端に接続する。
また電圧ＶRの一部をアナログ除算器１４に供給
して１／ＶＲの電圧信号を形成し、この電圧信号を抵
抗値R2の抵抗器１５を通じて増幅器１２の負側
の入力端に供給する。さらに増幅器１２の正側の
入力端を抵抗器１６を通じて接地する。 In FIG. 2, the voltage V R from the potentiometer 5 is supplied to the input terminal of the load of the operational amplifier 12 through the resistor 11 with a resistance value R 1 , and the connection point between the resistor 11 and the amplifier 12 is connected to the input terminal of the load of the operational amplifier 12. It is connected to the output terminal of the amplifier 12 through a resistor 13 of R f .
Also, a part of the voltage V R is supplied to an analog divider 14 to form a voltage signal of 1/V R , and this voltage signal is supplied to the negative input terminal of the amplifier 12 through a resistor 15 with a resistance value R 2 . do. Further, the positive input terminal of the amplifier 12 is grounded through a resistor 16.
従つてこの回路において、増幅器１２の出力端
には、
V′R＝−（Ｒｆ／Ｒ１ＶR＋Ｒｆ／Ｒ２・１／Ｖ
Ｒ）……(6)
なる出力電圧V′Rが得られ、この電圧V′Rを比較
回路６に供給することにより、ｒに反比例した項
も考慮した制御を行うことができる。 Therefore, in this circuit, at the output terminal of the amplifier 12, V′ R =−(R f /R 1 V R +R f /R 2 ·1/V
R )...(6) An output voltage V'R is obtained, and by supplying this voltage V'R to the comparator circuit 6, control can be performed taking into consideration the term inversely proportional to r.
こうして回転記録媒体の等線速度制御ができる
わけであるが、本発明によれば、制御の基準とな
る信号にピツクアツプのデイスクの中心からの距
離に反比例する項も含めたので、より正確な等線
速度制御を行うことができる。 In this way, it is possible to control the uniform linear velocity of the rotating recording medium.According to the present invention, the control reference signal includes a term that is inversely proportional to the distance from the center of the pickup disk, so it is possible to control the uniform linear velocity of the rotating recording medium. Linear velocity control can be performed.
なお第３図は本発明の他の例を示し、この例
は、周波数電圧変換回路７からの電圧ＶFも演算
増幅器１２に供給して、一時に制御電圧を得るよ
うにした場合である。 Note that FIG. 3 shows another example of the present invention, in which the voltage V F from the frequency-voltage conversion circuit 7 is also supplied to the operational amplifier 12 to obtain the control voltage at one time.
第１図は従来の装置の系統図、第２図は本発明
の一例の系統図、第３図は他の例の系統図であ
る。
１はモータ、２は磁気デイスク、３は周波数発
電機、４はピツクアツプ、５はポテンシヨメー
タ、６は比較回路、７は周波数電圧変換回路、１
２は演算増幅器、１４はアナログ除算器である。
FIG. 1 is a system diagram of a conventional device, FIG. 2 is a system diagram of one example of the present invention, and FIG. 3 is a system diagram of another example. 1 is a motor, 2 is a magnetic disk, 3 is a frequency generator, 4 is a pickup, 5 is a potentiometer, 6 is a comparison circuit, 7 is a frequency-voltage conversion circuit, 1
2 is an operational amplifier, and 14 is an analog divider.
Claims (1)
での距離に比例した信号と、モータの回転数に反
比例した信号とにより、上記モータの回転数を上
記ピツクアツプに対して等線速度となるように制
御するようにした回転記録媒体の等線速度制御装
置において、上記ピツクアツプの回転中心からの
距離に比例する項と上記ピツクアツプの回転中心
からの距離に反比例する項の差の信号と、上記モ
ータの回転数に反比例した信号との引算にて得ら
れた制御信号にて上記モータの回転数を制御する
ようにした回転記録媒体の等線速度制御装置。1. The number of rotations of the motor is controlled to be at an equal linear speed with respect to the pick-up using a signal proportional to the distance from the center of rotation of the rotating recording medium to the pick-up and a signal inversely proportional to the number of rotations of the motor. In the constant linear velocity control device for a rotating recording medium, a signal representing the difference between a term proportional to the distance from the rotation center of the pickup and a term inversely proportional to the distance from the rotation center of the pickup, and a signal corresponding to the rotation speed of the motor are used. A constant linear velocity control device for a rotating recording medium, wherein the rotation speed of the motor is controlled by a control signal obtained by subtraction with an inversely proportional signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7641477A JPS5410707A (en) | 1977-06-27 | 1977-06-27 | Equal linear velocity controller for rotary recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7641477A JPS5410707A (en) | 1977-06-27 | 1977-06-27 | Equal linear velocity controller for rotary recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5410707A JPS5410707A (en) | 1979-01-26 |
| JPS6244343B2 true JPS6244343B2 (en) | 1987-09-19 |
Family
ID=13604553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7641477A Granted JPS5410707A (en) | 1977-06-27 | 1977-06-27 | Equal linear velocity controller for rotary recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5410707A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4514771A (en) * | 1982-10-13 | 1985-04-30 | Victor Technologies Inc. | Method and apparatus for improving disk storage capacity |
-
1977
- 1977-06-27 JP JP7641477A patent/JPS5410707A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5410707A (en) | 1979-01-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0242215A3 (en) | Apparatus for data recording disc playback | |
| JPS6244344B2 (en) | ||
| JPS6244342B2 (en) | ||
| GB2086091A (en) | Disc record player | |
| EP0419149A2 (en) | Method and apparatus for effecting fuzzy control | |
| JPS6244343B2 (en) | ||
| JPH0630185B2 (en) | Recording device | |
| JPS622379B2 (en) | ||
| JPS5942391B2 (en) | Pickup control device for rotating recording media | |
| JPS62192077A (en) | Information recording and reproducing device | |
| JP2658449B2 (en) | Auto tracking device | |
| KR880000582Y1 (en) | Program detection apparatus | |
| JPH0135355Y2 (en) | ||
| JPH0525069Y2 (en) | ||
| JPH0376257U (en) | ||
| JPS6346891B2 (en) | ||
| JPH0447764Y2 (en) | ||
| JPS59175069A (en) | Reproducer for disk recording medium | |
| JP2634412B2 (en) | Recording / playback method | |
| JPS6037733Y2 (en) | Recording disc playback device | |
| JP2519326Y2 (en) | Magnetic tape with frequency signal recorded | |
| JPH0235387B2 (en) | KIROKUDEISUKUNOKIROKUOYOBISAISEIHOSHIKI | |
| JPH0357548B2 (en) | ||
| JPS60159560U (en) | Disc record playback device | |
| JPS5920456U (en) | magnetic recording and reproducing device |